Canadian Blood Services has to track the supply of and demand for various blood types. It estimates that 46% of the Canadian population has Type O blood, 42% Type A, 9% Type B, and the rest Type AB.

a) If a Canadian volunteers to give blood, what is the probability that this donor

i) Has Type AB blood?

ii) Has Type A or Type B blood?

iii) Is not Type O?

b) Among four potential donors, what is the probability that

i) All are Type O?

ii) None have Type AB blood?

iii) Not all are Type A?

iv) At least one person is Type B?